Question

In which of the following options is cartilage not present?
(a) Nose
(b) Ear
(c) Kidney
(d) Larynx

Answer 1

Hint: Cartilage helps in providing support to the parts of the body that are not supported by any bony or muscular structure. It is softer than the bones, therefore it is found in the particularly soft parts of the body.

Complete answer:
Out of four types of cartilages, the most common one is hyaline cartilage. The larynx has hyaline cartilage, nose and ear have yellow elastic cartilage. Therefore the only part of the body from the above options which does not have cartilage is the kidney.
1. Cartilage is a semi-rigid substance.
2. The core of cartilage is called aggrecan. The outer fibrous sheath of cartilage is called peri-chondria. Perichondrium has fibroblast cells which secrete matrix
3. Its matrix is made up of water, proteoglycans, some lipids, collagen, and some of the non-collagenous proteins.
4. There are 4 types of cartilage: hyaline, calcified, white fibrous, yellow, elastic.
5. Hyaline cartilage is the most prevalent cartilage. It has a matrix with a bluish color that appears to be glassy.
6. Calcified cartilage is formed due to the calcification of hyaline cartilage. It is, in comparison to other types of cartilages, less elastic.

So, the correct answer is, kidney.

Note:
Yellow elastic cartilage has the elastic fibers which provide them with stretchability. Elastic cartilage is found in the eustation tube, ear lobes, epiglottis, and the tip of the nose.
Hyaline cartilage is seen in the sternum, larynx, ribs, trachea, etc. It is found on many joint surfaces and makes up the fetal skeleton.
Calcified cartilage is seen in the supra-scapula of the pectoral girdle.